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(No Model.) l A. L. F. MITCHELL SDW. P. DAME.

Sgn IRON. No. 255,733. Y Patented Mar. 28,1882.

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JNITE STATES PATENT ENCE.

ALBION L. F. MITCHELL AND W, FRED DAME, OF LAWRENCE, MASS., ASSIG- ORSTO THEMSELVES AND MILTON B. TOWNSEND, OF SAME PLACE.

SAD-IRON.

SPECIFICATION forming part of Letters Patent No. 255,733, dated March28, 1882.

Application filed June 2, 1881.

` To all whom il may concern Be it known that we, ALBION L. F. MITCH-ELL and W. FRED DAME, of Lawrence, in the county of Essex andState ofMassachusetts,

have invented certain Improvements in Sad- Irons, of which the followingis a specification.

This invention relates to smoothing or polishing irons adapted to beheated internally by gas 5 and it has Jfor its object to enable an 1oiron of the above-named class to be eit'ectively and continuously heatedby a small consumption of gas; and to this end the invention consists inasmoot-hing-iron provided with a burner and adapted to receive gas andair under pressure and deliver the gas upon the bottom of the iron in acurrent surrounded by a current of air, thereby producing` upon suchbottom a flame of high heat, as we will now proceed to describe and claiThe accompanying drawing, forming part of this specification, representsa longitudinal central section ofthe smoothing-iron and its burner.

In carrying outour invention we provide a smoothing or sad iron,a,of anysuitable shape, and having an internal cavity, b. To the iron a weattach a burner adapted to deliver a current of gas surrounded by acurrent of air nnder pressure and to direct the same downwardly againstthe bottom of the iron. This burner is composed of an air-tube, c,screwed into the top of the iron, and a gas-tube, d,located within thetube c. Said air-tube has a tapered portion or valve-seat, c, upon itslower end, and terminates below said portion or seat within the chamberb in a contracted opening, f. The gas-tube d is threaded externally atits upper portion and screwed into. the tube c at a point where thelatter is offset, as shown 4o inthe ligure, and said gastube continuesdownwardly into the tube c and is separated therefrom by an annularspace, h. The lower end ot' the gas-tube cl is tapered at 'i to closelyfit the portion e of the air-tube, so that by adjusting the tube clvertically the annular opening `between the end t' and the seat e can beincreased or diminished to regulate the quantity of air passing to theopeningf. The gas-tube d has a small exit-orifice in its lower end, ar-

(No model.)

ranged to discharge a stream of gas into the 5o opening j'. The air andgas pipes are adapted to be connected respectively to ieXible tubes orpipes j lc, the former leading fromia blower or other air-forcingapparatus and the latter from an ordinary gas-pipe. The gas-tube d isadjusted vertically to regulate the supply of air by means of itsthreaded portion, and is held at any desired point of adjustment bymeans ofa jam-nut, Z. The iron a is provided in its sides with orificesm, to enable the gas 6ol to be ignited and for the escape ot theproducts of combustion. The lower end of the gas-tube is located closeto the outletf of the air-tube and slightly above the same, so that thegas from the tube d does not come in contact with the air until it isclose to and yet above the point wher e combustion takes place, thedischarging end of the tube d being surrounded by the annularair-passage, so that the gas issues in a current surrounded by a 7ocurrent ot' air. We have found that bythis arrangement a hotter flame isproduced with a given amount of gas than if the gas were mingled withthe air at a distance from the point of combustion, or it' the air andgas were 75 discharged from tubes having their dischargeorices side byside, instead of one above the other, as in sad-irons heretoforeemployed using gas and air. We believe such improved result to be due tothe fact that the gas is sur- 8o rounded by an annular stream of airwhich does not thoroughly mingle with the gas, but drives it in acomparatively undiluted condition toward the bottom of the iron, forcingit againstthebottom with avelocity proportioned to thequantilyot air andmingling thoroughly with the gas when the latter is deiiected by contactwith the bottom, thus matting the ame hottest at the bottom, instead' ofat the oritcef, the degree of heat being proportioned 9o to the volumeot' the air, and being therefore capable of regulation by means oftheadjustable tube d.

By our arrangement we are enabled to heat an iron at an expense for gasof about seven cents per day.

lf desired, the air may be heated before entering the burner.

Having thus described our invention, we

claim- 1. The combination of the chambered iron a and the burnerentering the upper portion of said iron, said burner being composed ofthe air-pipe c, adapted to be connected to suitable air-forcingapparatus, and having the central outlet-,ji and the gas-pipe d, havingits end located above and close to the outlet j', whereby a stream ofgas and a surrounding stream of air under pressure are directed upon thebot tom of the iron, substantially as and for the purpose set forth.

2. The combination of the chambered iron a and the burner composed ofthe air-pipe c,

